/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.cmd;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.ExecutionEntityManager;
import org.activiti.engine.runtime.Execution;

/**


 */
public class FindActiveActivityIdsCmd implements Command<List<String>>, Serializable {

  private static final long serialVersionUID = 1L;
  protected String executionId;

  public FindActiveActivityIdsCmd(String executionId) {
    this.executionId = executionId;
  }

  public List<String> execute(CommandContext commandContext) {
    if (executionId == null) {
      throw new ActivitiIllegalArgumentException("executionId is null");
    }

    ExecutionEntityManager executionEntityManager = commandContext.getExecutionEntityManager();
    ExecutionEntity execution = executionEntityManager.findById(executionId);

    if (execution == null) {
      throw new ActivitiObjectNotFoundException("execution " + executionId + " doesn't exist", Execution.class);
    }

    return findActiveActivityIds(execution);
  }
  
  public List<String> findActiveActivityIds(ExecutionEntity executionEntity) {
    List<String> activeActivityIds = new ArrayList<String>();
    collectActiveActivityIds(executionEntity, activeActivityIds);
    return activeActivityIds;
  }

  protected void collectActiveActivityIds(ExecutionEntity executionEntity, List<String> activeActivityIds) {
    if (executionEntity.isActive() && executionEntity.getActivityId() != null) {
      activeActivityIds.add(executionEntity.getActivityId());
    }
    
    for (ExecutionEntity childExecution : executionEntity.getExecutions()) {
      collectActiveActivityIds(childExecution, activeActivityIds);
    }
  }
  
}
